Mont. Code Ann. § 23-1-107

In carrying out the provisions of this part, the department may seek and accept the cooperation of other state and local agencies and the agencies of the federal government and may assist and cooperate with other state agencies, political subdivisions of the state, with neighboring states, and with the federal government in matters relating to acquiring, planning, establishing, developing, improving, or maintaining any park, parkway, recreational area, monument, historic site, or archaeological site.